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Today, physicists take the existence of black holes for granted. But back in the mid-1960s, the jury was still out: Were black holes a real feature of our universe, or a figment of mathematicians’ imaginations? The debate changed with a historic collaboration between mathematician Roger Penrose and physicist Stephen Hawking. Forty-five years after the publication of their 1970 Royal Society paper, Roger Penrose remembers the discoveries that led him and Hawking to believe that black holes really do exist, and that our universe started with a space-time singularity.

Remembering the Moment Black Holes Went Mainstream

Ryan Rykaczewski describes one of the most massive migrations on the planet, driven by the sun. Image by Tintinnidguy (Own work) [CC BY-SA 4.0 (http://creativecommons.org/licenses/by-sa/4.0)], via Wikimedia Commons 

#ExplainTheSun  - The Largest Migration on The Planet

Once, there was the ordinary incandescent light bulb. It shone brightly, but wasted much of the energy put into it as heat. Then came the compact fluorescent. And as costs have dropped, consumers have increasingly been switching to light-emitting diode (LED) technology for many lighting applications, in an ongoing search for a more efficient bulb. Now, in work published in the journal Nature Nanotechnology, researchers report that nanophotonic devices may be able to breathe new life into old incandescent technology. Marin Soljačić and Ognjen Ilic, two authors of the study, explain how they’ve been able to “recycle” some of the incandescent bulb’s wasted heat and re-emit it as visible light, boosting efficiency.

For the Lowly Incandescent Bulb, a Ray of Hope

Science, technology, and other cool stuff from public radio's Science Friday. It's brain fun, for curious people. From WNYC Studios.

Remembering the Moment Black Holes Went Mainstream

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